The Block Australia has celebrated a significant milestone.

The popular home renovation competition show has begun its 20th season, and fans from both sides of the Tasman have tuned in to keep it going.

Host and former tradie Scott Cam says he's been with the network for 25 years - and he never expected the show to last as long as it has.

"I've done about 10 different shows, this one is the last show I've done, which I thought we'd get a couple years out of - and we've ended up going for years."

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